Seeming serious is often needed for others to do business with you. E.g. I believe ARIN and APNIC will only let companies hold internet number resources (while RIPE will also allow sole proprietors, but that's only relevant if you're in Europe). Enterprise B2B companies just don't have their systems set up to deal with sole proprietorships.
Sure. If you find yourself needing ARIN services and that's what they need to move forward then that's what you have to do. All I'm saying is that it's not a thing to set up preemptively.
